/Engine/Source/Runtime/RHI/Public/GPUProfiler.h
Returns a pair of timestamps performed on GPU and CPU at nearly the same time, in microseconds.
CPU and GPU timestamps, in microseconds. Both are 0 if feature isn't supported.
static [FGPUTimingCalibrationTimestamp](API\Runtime\RHI\FGPUTimingCalibrationTimestamp) GetCalibrationTimestamp ( uint32 GPUIndex )